ZOBODAT - www.zobodat.at Zoologisch-Botanische Datenbank/Zoological-Botanical Database Digitale Literatur/Digital Literature Zeitschrift/Journal: Linzer biologische Beiträge Jahr/Year: 2007 Band/Volume: 0039_1 Autor(en)/Author(s): Fery Hans, Petrov Pyotr N., Alarie Yves Artikel/Article: Notes on the identity of Oreodytes dauricus (MOTSCHULSKY 1860) and other members of the O. alaskanus-clade (Coleoptera: Dytiscidae) 65-78 © Biologiezentrum Linz/Austria; download unter www.biologiezentrum.at Linzer biol. Beitr. 39/1 65-78 23.7.2007 Notes on the identity of Oreodytes dauricus (MOTSCHULSKY 1860) and other members of the O. alaskanus-clade (Coleoptera: Dytiscidae) H. FERY, P.N. PETROV & Y. ALARIE A b s t r a c t : Males of Oreodytes dauricus (MOTSCHULSKY 1860), so far poorly known and considered Palaearctic, were studied and their genitalia compared for the first time with those of similar species. O. dauricus is found to be a senior synonym of the Nearctic O. recticollis (FALL 1926) (n.syn.) and O. leechi ZIMMERMAN 1985 (n.syn.), which in the past could only be suspected, but not proved, because of the Palaearctic population only females had been available. The species is re-described, with illustrations of male and female genitalia; its geographical distribution is mapped. The lectotype of Hydrocoptus dauricus MOTSCHULSKY 1860 – currently placed in the genus Oreodytes SEIDLITZ 1887 – is designated. O. dauricus is one of four members of the O. alaskanus-clade, for which a key to species is given. K e y w o r d s : Coleoptera, Dytiscidae, Oreodytes, O. alaskanus-clade, lectotype, new synonyms, description, key to species. Introduction In the past, the identity of Oreodytes dauricus (MOTSCHULSKY 1860), was more or less unclear, since not many specimens have been available and, in particular, those of Motschulsky’s syntype series stored in ZMUM were almost totally destroyed by Dermestidae. After Motschulsky, ZAITZEV (1906, 1915, 1953, 1972), ALARIE (1993), and probably also MATIS & GRAMMA (1975) seem to be the only entomologists who have ever studied a Palaearctic O. dauricus, and none of them has studied the male genitalia. We have found in the literature ca. 30 works in which the name O. dauricus is men- tioned. In most cases the name is only given in simple lists, in others the original de- scription or that of ZAITZEV (1906) is reproduced, and this is why we do not cite them all in the present work. Already HATCH (1933: 25) discussed the similarity of O. dauricus with O. recticollis (FALL 1926), emphasising the "three strongly impressed series of dorsal punctures" on each elytra of O. dauricus as the single distinguishing character, but by this only repeating a part of MOTSCHULSKY’s description (1860: 100): "... trois lignes de points, fortement imprimés... sur chaque élytre...". LARSON (1975: 322) treated O. recticollis as synonym of O. alaskanus (FALL 1926) (both under the genus name Hydroporus), cited HATCH (1933) and added: "If these are conspecific, the name H. [= © Biologiezentrum Linz/Austria; download unter www.biologiezentrum.at 66 Hydroporus] dauricus has priority." Both authors, however, deduced their conclusion only from Motschulsky’s description, and had not studied any Palaearctic specimens of O. dauricus. Recently collected Palaearctic material of O. dauricus and the discovery of two males from Motschulsky’s syntype series enable us to confirm the so far only suspected syno- nymy of O. dauricus with O. recticollis. We take the opportunity to modify the key to the alaskanus-clade members given in LARSON et al. (2000), including for the first time O. shorti SHAVERDO & FERY (2006), which has recently been described from Mongolia. This key, which was originally created only for Nearctic species, can now be applied to all members of this Holarctic clade. Material and methods The following codens for collections from which we have studied material are used in the text: CAN....... coll. A.N. Nilsson, Umeå, Sweden CHF........ coll. H. Fery, Berlin, Germany; property of the Naturhistorisches Museum Wien, Vienna, Austria CYA....... coll. Y. Alarie, Sudbury, Canada MNB ...... Museum für Naturkunde, Humboldt-Universität, Berlin, Germany (M. Uhlig, B. Jaeger) MZLU .... Museum of Zoology Lund University, Lund, Sweden (R. Danielsson) SMTD .... Staatliches Museum für Tierkunde, Dresden (O. Jäger) ZISP ....... Zoological Institute of the Russian Academy of Sciences, St. Petersburg, Russia (A.G. Kirejtshuk) ZMUM... Zoological Museum, Lomonosov State University, Moscow, Russia (N.B. Nikitsky) The following abbreviations are used in the text: TL (total body length), MW (maximum body width), hw (handwriting), and hw? (unknown handwriting). For the representation of the longitude/latitude data of localities we use the decimal style. Numbers in curly brackets mark localities and refer to those in the map (Fig. 19). Taxonomy The Oreodytes alaskanus-clade includes four species in total: the Nearctic O. alaskanus and O. productotruncatus (HATCH 1944), the Holarctic O. dauricus, and the Palaearctic O. shorti from Mongolia. According to ALARIE (1993: 865), the O. alaskanus-clade members are characterised by the deeply curved inner margin of the protibia (Figs 11-14) in both sexes. Another conspicuous feature is the subapical lateral tooth on each female elytron (Fig. 15), a character, however, shared with the Palaearctic O. alpinus (PAYKULL 1798), O. mongolicus (BRINCK 1943), O. kanoi (KAMIYA 1938), and the Nearctic O. laevis (KIRBY 1837). Oreodytes dauricus (MOTSCHULSKY 1860) Hydroporus dauricus MOTSCHULSKY 1853: 6 (nomen nudum). Hydrocoptus dauricus MOTSCHULSKY 1859: 489 (nomen nudum), 1860: 100 (original description), 1878: 61. - SHARP 1882: 785. © Biologiezentrum Linz/Austria; download unter www.biologiezentrum.at 67 Hydroporus dauricus (MOTSCHULSKY); ZAITZEV 1906: 173, 1915: 253. - LARSON 1975: 322. Hydroporus (Oreodytes) dauricus (MOTSCHULSKY); HATCH 1933: 25. Hydroporus alpinus ? var. dauricus (MOTSCHULSKY); BRANDEN 1885: 50. Deronectes dauricus (MOTSCHULSKY); ZIMMERMANN 1919: 190, 1920: 130, 1933: 184. - BRINCK 1946: 148, 154. Oreodytes dauricus (MOTSCHULSKY); ZAITZEV 1953: 184, 1972: 196. - MATIS & GRAMMA 1975: 218. - ALARIE 1993: 865. - NILSSON 1995: 54, 2001: 178, 2003: 67. - KIREJTSHUK 2001: 167. Oreodytes alpinus (PAYKULL); LAFER 1989: 241 (giving O. dauricus as synonym of O. alpinus). Hydroporus recticollis FALL 1926: 140. (n.syn.) Oreodytes recticollis (FALL); ALARIE 1993: 864 (designation of lectotype), 1997: 423 (description of larva). - LARSON et al. 2000: 464. - NILSSON 2001: 179. Hydroporus alaskanus FALL; LARSON 1975: 321 (giving H. recticollis as synonym of H. alaskanus). Oreodytes alaskanus (FALL); ZIMMERMAN 1985: 110 (giving O. recticollis as synonym of O. alaskanus). Oreodytes leechi ZIMMERMAN 1985: 110. (n.syn.) Type material of Hydrocoptus dauricus: L e c t o t y p e (by present designation): (, a small golden square label without any text, "Dauria, Mots." [hw Motschulsky], "13819" [yellow], "Hydrocoptus Dauricus Mots." [hw Motschulsky], "Staatl. Museum für Tierkunde. Dresden", "Lectotype, Hydrocoptus dauricus Motschulsky, 1860, des. H. Fery 2005" [red, printed] (SMTD). N o t e s : The lectotype lacks the apical third of the last right protarsomere including the claws and nine articles of the right antenna, and the side of the right elytron is slightly damaged. Paralectotypes: 1&, a white square label without any text, "Type." [printed], "dauricus Mot... [almost illegible], Dauria" [hw Motschulsky], "dauricus Motsch. Dauria" [hw?, not Motschulsky!], "Zool. Mus. Berlin" [printed] (MNB). 3((, 1&, 2 exs. (sex identification impos- sible), "type" [hw Motschulsky], "Mt. Hamar-Dab." [light reddish brown label, letters printed in black], "Hydrocoptus dauricus, Daur. Alp. Motsch."[hw Motschulsky], "1226." [pink, hw Zaitzev]. The label "1226." relates to the item number presumably given by ZAITZEV (1915: 253) according to the order of specimens as they originally stood in coll. Motschulsky. All specimens originally glued onto a single transparent card. The specimens were separated by the senior author, and the pins provided with copies of the original labels. Each paralectotype is provided with a respective red label (ZMUM). Notes: As ZAITZEV (1915: 253) already noted ("6 specimens, strongly damaged"), all the former syntypes from coll. Motschulsky (ZMUM) are in a poor condition caused by Dermestidae (see also ZAITZEV 1953: 184, 1972: 196). Nevertheless, the aedeagus of one male paralectotype is rather well preserved, although most of the rest of the body is missing. The median lobe is slightly broken short before apex, but eaten only distally so that its characteristic shape is perfectly recognisable, as well as that of the parameres. Type locality: Russia, "les alpes de la Daourie". According to MOTSCHULSKY (1845: 129) and SCHÜTZE & KLEINFELD (1997: 79) the Dauria region encloses the south-eastern part of Transbaikalia (= Zabaykal'ye) and, thus, is situated south-east of Lake Baikal, not far from the Mongolian and Chinese border. MOTSCHULSKY (1845: 129) specified "includes the region around Nertschinsk [= Nerchinsk, ca. 52.00N 116.55E] {3} with the mountain ranges and mines". Paralectotype localities: The Hamar-Daban (= Khamar-Daban) mountain range is situated in the Irkutsk oblast and the Buryatiya republic, south of the south-eastern part of Lake Baikal {2} (ca. 51N 104E; see also the map in MOTSCHULSKY 1860). N o t e s : Initially, we wanted to select the one male syntype with almost complete aedeagus of the